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Well, with this application it seems that you cannot make use of predefined fields like you do in Import Data section (which I cannot see and use despite all my effort). Predefined fields are not available and it just appends structures to includes of related business objects.

Moreover, you cannot choose data type NUMC in this app unfortunately. When you choose "NUMBER", it offers "DEC" as data type. You can control length before decimals and after decimals however you cannot control output length so the length turned out to be much more than you expect. You cannot edit the output length in SE11 either as they're created automatically via this app.

I was really excited to use this app and I used it to create some custom fields but had to delete all of them because of the reasons I explained in previous paragraph. I started over with transaction BOB and appended structures to business objects manually as it's explained in Extensibility Guide.

I do think this app really looks cool and quite user-friendly however it needs some more work so that we have control all over data types and their lengths...

the option to add predefined-fields using the Import Data UI is not available for cloud customers. Here you have to use the app "Custom Fields and Logic" already mentioned by Matthias.

For OnPremise, it depends on the release you have. Until 1611, there should be no limitation. For newer releases, the additional fields can only be maintained for entities that have already been enhanced before, to be backward-compatible. But you cannot enhance any new entity, for this you have to use "Custom Fields and Logic".